"taking birth control pills increases the risk of heart attack, stroke, and blood clots in certain women. Serious side effects such as these are more likely in women over 35 years of age who smoke cigarettes and in those with specific health problems such as high blood pressure, diabetes, or a history of breast or uterine cancer." This was taken from this website: http://www.chclibrary.org/micromed/00059000.html

Here are some more websites to check out that have additional information

http://www.csub.edu/healthcenter/BCPs.htm

http://www.surgerydoor.co.uk/medical_conditions/Indices/F/fibroids.htm

http://health.ivillage.com/gyno/gynobc/0,,bw_7h7rk5xd-p,00.html